Hello friends iam kunwar singh and I personallu use airtel network. I am so fed up with this operator there are lots of reason for my statement. First and the mist important reason of it is that the airtel is very costly. Its talktime and data plans are so costly that it ruined my lot of money. As I upgraded my sim to 4G but iam not having signals of 4G and do not have such internet speed as they behave superior in their ads about the plans and signal quality of their operator . I would definately recommend everyone that its too expensive so not buy this sim.